Locking device for extension-tables.



PATENTEDMALR. 10. 1906.

w. M. JOST. LOCKING DEVICE PORBXTENSION TABLES;

APPLICATION FILED SEPT. 23, 1905.

l ll WILLIAM M. JOST, OF CHICAGO, ILLINOIS.

LOCKING- DEVICE FOR EXTENSION-TABLES.

Specification of Letters Patent.

Patented March 10, 1908.

Application filed September 23, 1905. Serial No. 279,846.

To all whom it may concern:

Be it known that I, WILLIAM M. JosT, a citizen of the United States,residing at Ohicago, in the county of Cook and State of Illinols, haveinvented a certain new and useful Improvement in Locking Devices forExtension-Tables, of which the following is a full, clear, concise, andexact description, reference being had to the accompanying drawings,forming a part of this specification.

My invention relates to tables and especially to a form of table made ofseparable parts, so that it can be elongated to increase its size.

The principal object of my invention is to provide a simple, ractical,effective and inexpensive form of ocking device, for locking the twoparts of the table together.

In the accompanying drawings, Figure 1 is a vertical section of a tableembodying my present invention. Fig. 2 is a cross-section taken on line22 in Fig. 1. Figs. 3 and 4 are views of details of construction.

Referring to Fig. 1, I have-shown the table having legs 1, 1, and centercolumn 2 and a top 3. The center column 2 and the top 3 are split ordivided so that one part of the table can be separated from another. Thetop 3 is conveniently provided with draw bars 4, 4, by which theseparable parts of the top can be guided in their separation from oneanother in the usual way. The top is provided with a central leg 5,which extends down through column 2, being secured to one set of drawbars 4, 4, by a cross-bar 6. top 3 is supported by brackets 7, 7, whichare secured to the column 2, but which will not be described in detailin this application, as this construction is made the subject matter ofa separate application, executed of even date herewith Serial No.279,845. The separable parts of the column 2 are locked together by alocking device, consisting of an annular castin 8, adapted to fit insideof the column 2, and aving 1ts ends provided with short hooks 9, 9. Thisannular member 8 is pivotally connected with one portion of the column2, by pivots 10, 10. A link or rod 11 is pivotally connected with theannular lever or looking member 8, at 12, said member being providedwith spaced upwardly projecting cars a a for this purpose. The rod 11extends up in the column 2 and is piv- The otally connected with thebell crank 13, which is pivotally supported at 14 upon the top of thecolumn2 to rock in avertical plane.

The rod 11 which is straight for the greater portion of its length ispreferably curved at its upper end where it connects with the bellcrank. The other side of the bell-crank 13, is pivotally connected witha link 15, which is 1n turn pivotally connected with a lever 16pivotally supported at 17 to a bracket 18 secured to the under side ofthe table top. The strip of metal forming the link 15 is bent or twistedto provide an outer flat portion lying in the same horizontal plane asthe lever 16, said portion extending beyond the pivot 17 and beingcurved toward said pivot where it.

makes connection with the lever 16. The other side of the column 2 isprovided with pins 19, 19, with which the hooks 9, 9 are adapted toengage. Thus the operation of the device is, that to lock the table thelever 16 is drawn to one side so that the link 15 draws upon the bellcrank 13, and thereby elevates the rod 11, and causes the annular partof the member 8 to rise and the hooks 9, 9 to descend, and therebyengage the pins 19, 19. To unlock the table the lever 16 is swung in theopposite direction, withthe result that the hooks 9, 9 are elevated andthereby disengaged from said pins.

' It will be seen that this form of locking device is simple, practicaland inexpensive and embodies a minimum number of parts which can becheaply constructed and easily assembled.

What I claim as my invention is:

In a table of the class described, the combination with the separableportions of the supporting column, of a locking device comprising acurved member pivotally connected with one part of said column andhaving its ends provided with hooks or catches, said curved member beingalso provided intermediate its ends with upwardly rojecting ears, a rodpivotally connected with the locking member between the ears thereof, abell crank pivotally connected with said rod, and pivoted at the top ofsaid column to rock in a vertical plane, said rod bein straight for thegreater portion of its length ut curved at its u per end for connectionwith the bell crank, abracket secured to the table top, alever pivotallysupported by the bracket in a horizontal position, a link pivotallyconnected With 1 my name this 21st day of September A. 1)., the bellcrank and having its outer portion l 1905. bent to lie in the samehorizontal plane as the l lever, said link being curved at its outer end5 toward the pivot of the lever and pivotally Witnesses:

connected to said lever. m A. MILLER BELFIELD,

In Witness whereof, I hereunto subscribe I. C. LEE.

WILLIAM M. JOSD

